C.E. Smith Trailer Hub Kit - 1-3/8" x 1-1/16" Tapered - 5 x 4-1/2" Galvanized. E. Smith Trailer Hub Kit features a 6x5.5 inch stud and is compatible with most new model trailers that have a 6x5.5 inch spindle. The C.E. Smith Hub Assembly will fit your trailer correctly the first time every time. These hubs come fully assembled with pregreased bearings which cuts down on the mess and makes installation on the axle much easier. For a full line of Trailer Hubs from C.E. Smith please visit our C.E. Smith trailer hubs page. For more brand name trailer hubs please visit our trailer hubs store section. Package Contents: C.E. Smith Trailer Hub Kit C.E. Smith 13515: Trailer Hub Kit - 1-3/8" x 1-1/16" Tapered - 5 x 4-1/2" Galvanized